Navigation in an anchorage and 'Anchoring Safe Practice' for cargo ship
Prior approaching an area for anchoring ships master should investigate fully a suitable anchoring position and conduct a planned approach including speed reduction in ample time and orienting the ships head prior anchoring to same as similar sized vessels around or stem the tide or wind whichever is stronger . Final decision to be made on method of anchoring to be used , the number of shackles , the depth of water, expected weather and holding ground.
More collisions between cargo ships may occur in
anchorages than anywhere else, and while it is
very rare for a ship to sink or for lives to be
lost, as anchorages are close to land the risk of
pollution is high.
Fig: preparation for anchoring
Ports have an attitude to their
anchorages that ranges from disinterest in
where a ship anchors to maintaining
designated anchorages within the port areas,
which are either on the chart or at the
instruction of the port. However, when an
accident occurs the port will place the
responsibility with the ship, no matter how it
occurred. This is because the Master is always
ultimately responsible for the navigation of the
ship. If he feels that an anchorage is unsafe he
should not attempt it.
Deciding not to anchor may be an acceptable
position if the berth will be available in a few
hours and the ship has seaway where it can
either heave to and drift or slowly cruise
around. It is not acceptable where there is a
longer waiting time or if the ship has to
navigate a long passage back to a safe area.
In the latter circumstance it is possible that the
ship could miss the berthing time as a result of
moving to a safe area having decided that the
anchorage is unsafe. Where does the captain
legally stand in the face of claims at that point?
It should also be remembered that many ports
do not accept that a ship has arrived, for notice
or readiness purposes, until the ship has
actually anchored in a defined port area
anchorage, effectively making anchorage
compulsory.
Regulations for anchoring safe practice
Navigation in an anchorage is the Master’s
responsibility, but it is an area of great potential
danger as ships are gathered in close quarters
and are hampered in their movements.
Unfortunately it is also an area largely ignored
by the international regulations, which still
expect ships to still conduct themselves as if
they were on the open sea.
While this is workable in theory, it is not entirely
practical and while the regulations allow local
port authorities to make rules for their port and
roadsteads, it would take a brave port
management to make navigational rules that
conflict with the international regulations.
A ship approaching an anchorage will find it
difficult to recognise if another ship is at
anchor, about to anchor or is about to get
under way. Where possible, vessels will
approach their anchor position into the wind
and current, which means that all the other
ships in the anchorage will be presenting a
stern aspect. The signal for an anchored
vessel during daytime is a small black ball
hoisted forward, which is usually completely
out of sight for any approaching vessel. At
night, while an anchored vessel is fully lit, there
will still be nothing to indicate that it is about to
heave anchor.
Anchor signals that were designed a century
ago are no longer appropriate for today's
shipping. More practical methods could be
designed or it could be an excellent place for
ports to apply local rules and proactive
management.
Manoeuvrability of vessels within an anchorage
Ships within anchorage areas have varying
limits to their manoeuvrability, and generally
the larger the ship the less the degree of
manoeuvrability. In a worst case scenario, a
loaded VLCC or VLBC making a final approach
may well have stopped its engine a mile from
the selected position, with the ship at a speed
of four knots or less. When light, particularly if
deballasted ready for loading, its
manoeuvrability would be severely hampered
by the wind and current.
At a distance of up to three cables from the
anchor position and with the engines about to
come astern, a vessel is not able to manoeuvre
within the context of the existing rules.
However, under these rules, the ship is still
required to comply with the international
regulations.
Anchoring and Weighing Anchor
Before using an anchor a competent seafarer should check that the
brakes are securely on and then clear voyage securing devices. A responsible
person should be in charge of the anchoring team, with an adequate
communications system with the vessel's bridge. The anchoring party should
wear appropriate safety clothing - safety helmets, safety shoes and goggles as
a minimum protection from injury from dirt, rust particles and debris which
may be thrown off during the operation. Wherever possible, they should
stand aft of the windlass.
Where the means of communication between bridge and
anchoring party is by portable radio, the identification of the ship should be
clear to avoid misinterpretation of instructions from other users of such
equipment.
Before anchors are let go, a check should be made that no small
craft or other obstacle is under the bow. As a safety precaution it is
recommended that the anchor is `walked out' clear of the pipe before letting
go. For very large ships with heavy anchors and cables, the anchor should be
walked out all the way to avoid excessive strain on the brakes (and on the
bitter end if the brakes fail to stop the anchor and chain).
Where the anchor is let go from the stowed position, if upon
release of the brake, the anchor does not run, personnel should NOT
attempt to shake the cable, but the brake should be re-applied, the windlass
placed in gear, and the anchor walked out clear prior to release.
Cable should stow automatically. If, for any reason, it is necessary for
personnel to enter the cable locker, they should stand in a protected position
and, as far as possible, have constant communication with the windlass operator.
Anchors housed and not required should be properly secured to
prevent accidental release.
Potential problems deciding 'where to anchor' ?
In anchorages without defined anchor
positions, a problem that often arises is that of
ships anchoring too closely. Each Master will
have his own view of what constitutes the safe
distance that his ship may anchor from other
vessels, This will take into consideration the
existing or expected weather conditions,
exposure of the anchorage, size of the ship,
holding ground and occasionally engine
maintenance requirements.
However, safe distance can very much be a
matter of perspective and what is acceptable to
a coastal vessel would be too close for a
VLCC. Take, as an example, a situation where
a VLCC or VLBC anchors at a distance of
seven cables from other vessels. A little later a
coastal ship comes along and anchors within
two cables. For the small ship this feels to be a
safe distance, but not for the larger one. The
large vessel may now protest about the
position of the other vessel but, if the smaller
ship refuses to move, the Captain of the larger
ship has a duty to move his ship to a safe
position if he believes there is a danger. In
extreme circumstances, in a busy unrestricted
anchorage, the larger ship could feasibly be on
the move all day or even be forced out of the
anchorage altogether.
Again, this would feel to be something that the
port should lead or advise on, either by
defining positions or providing a ruling to an
appeal.
Defining Anchorages area limits and types
If the international regulations cannot
adequately cope with the navigational
difficulties of an anchorage, the anchorage
itself, the way it is defined and how it is
controlled become extremely important.
There is a great deal that ports can do to
alleviate some of the problems, and with the
increasing pressure to properly control
pollution and environmental damage it would
appear to be a good time for a review of both
new and existing anchorages.
Anchorages fall into three basic types:
i) Open anchorage :an undefined anchorage
in open waters
ii) Defined anchorage :an anchorage in open
waters with defined limits
iii) Confined anchorage:an anchorage that is
confined on more than
one side by natural or
manmade hazards.
Many of the comments made here would
appear to be relevant only to the second two,
but it is my belief that even in the open
anchorages more port assistance is desirable.
Safe Anchorage Design
Many anchorages and their limits have
remained unchanged for a long period of time,
despite changes in the nature of the port’s
commercial activities. Anchorages were rarely
‘designed’ but instead were developed as ships
anchored near the port. As the numbers
increased the port developed and a line was
often simply drawn around the area to limit
A number of ports have carried out these
changes. However, while the number is
growing there are still comparatively few and
during implementation there has been little
agreement about safe distances for assigned
anchorages.
A range of ports with anchor
positions were surveyed and the results
showed that, at anchor, large ships use
between three and a half and six cables. Most
Masters who command VLCCs regard seven
cables as a minimum and many require one
mile, particularly in areas where the weather is
variable.
Often ships wonder how anchorages were drawn up?
Of the ports that have established anchor
positions, none have yet assumed
responsibility for traffic control or advice within
their anchorage areas. A busy anchorage with
constant traffic movement could be compared
to an airport, but it is unimaginable that aircraft
would be allowed to move freely on the ground
without any control or advice. The same should
apply to ships within an anchorage.
The pressure on ports to control pollution is so
strong that a port with an accident in an
anchorage, with ships moving without any
traffic advice,control or designated anchor
positions, might well find itself being asked
serious questions about such an incident in the
future.
In summary, Port Authorities and
Harbour Masters must consider the following:
i) A review of their ports existing
anchorages and the traffic using them. A
redesign of the anchorage areas may
need to be carried out
ii) separation of anchorages into areas for
different sizes of ships
iii) designated anchor positions
iv) the establishment or extension of
existing traffic advice or control service
to cover their anchorage areas. This
advice should include traffic movements
in and out of the anchorage or port and
the local weather conditions
v) where anchorages extend seaward
beyond the port’s approach fairways, the
establishment of routeing lanes from the
fairway to beyond the anchorage areas
vi) pilot positions that are clear of the
anchorage and fairway
vii) in busy ports, where anchorages are
defined or restricted, an overflow area
should be provided. This will be where
ships can anchor if the main anchorages
are full, and where they will be allowed
to "arrive" for notice of readiness
purposes.
Traffic advice within an anchorage and responsibilities between ship and port control
Too many ports who provide a
traffic advice service claim that they have traffic
control advice, and the difference is
considerable. Traffic control is when a port is
capable of directing the navigation of ships
from a shore based radar, with this service
operated by trained and experienced
professionals. Without these professionals and
regardless of the radar system and its
availability, the only service that can really be
offered is advice.
Very few modern ports exercise control or give advice
on or to traffic in their anchorage areas.
It is acceptable that, in open
anchorages where ships can anchor where
they choose and with no restrictions apart from
those imposed by draught and depth, it is
reasonable for the port to have no
responsibility except to advise ships of traffic
movements. However, even if actual
responsibility is to continue to reside solely with
the master.
But for defined and confined anchorages more
responsibility must be taken by port control as well.
If a port instructed a ship to anchor
in a defined or restricted anchorage that is
already full, by acceptable seamanship
standards, what if the ship collided with
another vessel while attempting to comply?
While the ship attempting to anchor will still
have to accept blame, it is arguable that some
level of responsibility for the incident should
also fall with the Port and Harbour Master.
International regulations do
not and cannot adequately cover the safe
navigation of ships in anchorage. The
numerous accidents in anchorages that cause
both damage and pollution means that some
level of joint responsibility between the ship
and port in endeavouring to provide safe
conditions for ships using the port and the
ports environment is a necessity. There must
be acceptance of the fact that defined and
restricted anchorages need some form of traffic
control or advice and that ships should be
allocated anchor positions.
Ports need to make a survey of the ships using
their anchorages and then plan or re-design.
Anchorages should be separated by ship size
with separate areas for coastal, medium and
large vessels. Anchorage positions within
these areas should be allocated with a radius
based on the size and manoeuvring limitations
of the ships assigned to them.
The anchorages
should be clear of through traffic routes and
there must be a clear approach channel that is
restricted to vessels using the pilotage service
and that extends seaward beyond the furthest
limits of the anchorages. The pilotage area
should be clear of the approach channel and
the anchorages.
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Prior approaching an area for anchoring ships master should investigate fully a suitable anchoring position and conduct a planned approach including speed reduction in ample time and orienting the ships head prior anchoring to same as similar sized vessels around or stem the tide or wind whichever is stronger . Final decision to be made on method of anchoring to be used , the number of shackles , the depth of water, expected weather and holding ground. . More .....
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